docs: def slug_with_level(self, language=None):
          """Display the slug of the page prepended with insecable
          spaces to simluate the level of page in the hierarchy."""
          level = ''
          if self.level:
              for n in range(0, self.level):
                  level += '&nbsp;&nbsp;&nbsp;'
          return mark_safe(level + self.slug(language))